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Misoc: Add commits and warnings about missing caculation of the timer reload value

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This commit is contained in:
Gregory Nutt 2016-11-22 12:15:34 -06:00
parent d1e84fb788
commit 054072d054
1 changed files with 6 additions and 5 deletions
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11
arch/misoc/src/common/misoc_timerisr.c
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@ -63,13 +63,13 @@
* system clock ticks per second. That value is a user configurable setting
* that defaults to 100 (100 ticks per second = 10 MS interval).
*
* The RCC feeds the Cortex System Timer (SysTick) with the AHB clock (HCLK)
* divided by 8. The SysTick can work either with this clock or with the
* Cortex clock (HCLK), configurable in the SysTick Control and Status
* register.
* What clock feeds the timer? What rate does the timer increment by. The
* correct reload value is:
*
* reload = Finput / CLOCKS_PER_SEC
*/
#define SYSTICK_RELOAD ((MISOC_CLK_FREQUENCY / CLOCKS_PER_SEC) - 1)
#warning Missing logic
/****************************************************************************
* Public Functions
@ -118,6 +118,7 @@ void misoc_timer_initialize(void)
timer0_en_write(0);
/* FIX ME, PUT PROPER VALUE */
#warning Missing logic
timer0_reload_write(80000);
timer0_load_write(80000);